Prosthetic knee



FIG. 1 is a top left front perspective view of a prosthetic knee;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom left front perspective view thereof.

CLAIM The ornamental design for a prosthetic knee, substantially asshown and described.